a paradise for early humans.

Scientists Found Evidence of Our Ancient Human Ancestors Underwater,
Suggesting a Sunken World

Some of the early hominins evidently went island hopping.

    Fragments of a Homo erectus skull were among deposits of
vertebrate fossils found when the Indonesian seafloor was being
dredged for a construction project

    This is the first time fossils of this species have been found on
the seafloor between the islands of Indonesia, and further
investigation found that land bridges once connected the islands.

    Evidence of Homo erectus hunting bovine ancestors and extracting
bone marrow was also discovered.

https://www.popularmechanics.com/science/archaeology/a64838465/homo-erectus-java/